I'm thinking of putting together a kit containing a selection of common gaskets used in oil boilers including stuff like Danfoss and Riello pump pressure screw o-rings, pump cover and filter seals, flow switch o rings, heat exchanger fibre washers etc, a bit like the Holdtite washer boxes idea. I have found you often have to buy a huge box of o rings when you only end up needing the odd couple of sizes. Would anyone be interested? Any suggestions about what would be useful to include?